Sunday evening with the new moon, I went out to shoot the Milky Way. While I was shooting a stitched pano, on a tripod, with an external shutter release - SR would pop on randomly for some frames and off for others - both with and with out GPS enabled or even physically mounted .
Using PhotoMe, I looked at the EXIF Meta data and sure enough, Image Stabilizer was
Stabilized for the problem image and
Not Ready for the image that was OK. These were 8 second images, so they were taken within a couple of seconds of each other - just enough for the initial image to save and be displayed and recognized as a problem, followed by taking an additional replacement image (that turned out to not have the problem).
Through out the night, I was sort of trouble shooting after I saw this start happening. Initially was using the O-GPS1 and it happened once (where the sensor was stabilized and not astrotracking. Then with the GPS still mounted, I was just taking some non GPS shots and it was occurring. So, I removed the GPS unit from the body of the camera, and still had this occurring. Then replaced the battery in the camera with a fresh one, and it still happened yet again. This problem occurred across two lenses.
Question - has anyone else had this happen? I have probably 20 images that this occurred to. I have had the body about 18 months now, along with a Pentax warranty. Considering sending it in to the vets.
It was not a stellar evening for me. I swapped lenses and left the lens cap on for 21 shots.
Just for grins the two shots below were 8 seconds at f1.8 at ISO 3200 at 19mm
What is interesting is on the first image given that the landscape is blurred, it looks like the GPS (astrotracking) was on along with SR - which is not suppose to happen